License Global's version of the Avengers 4 plots reads: "An unprecedented cinematic journey ten years in the making and spanning the entire Marvel Cinematic Universe, Marvel Studios’ Avengers: Infinity War brings to the screen the ultimate, deadliest showdown of all time.

"The Avengers and their Super Hero allies must be willing to sacrifice all in an attempt to defeat the powerful Thanos before his blitz of devastation and ruin puts an end to the universe."

The still unknown title for Avengers 4 has been described as a "spoiler" of sorts for Infinity War.

How this works in practice is still unknown, but fans have taken to speculating plenty of different titles in the meantime.